In DM 1.0, you need to enable enable-heartbeat to generate the monitor data. In DM 2.0 and later versions, it is expected to have no data in the monitor metric replicate lag because this feature is not supported.
In DM 1.0, you need to enable enable-heartbeat to generate the monitor data. In DM 2.0 and later versions, it is expected to have no data in the monitor metric replicate lag because this feature is not supported.